3878723155 has 4 divisors (see below), whose sum is σ = 4654467792. Its totient is φ = 3102978520.

The previous prime is 3878723153. The next prime is 3878723171. The reversal of 3878723155 is 5513278783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5513278783 = 2069 ⋅2664707.

It is not a de Polignac number, because 3878723155 - 2¹ = 3878723153 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3878723099 and 3878723108.

It is not an unprimeable number, because it can be changed into a prime (3878723153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387872311 + ... + 387872320.

It is an arithmetic number, because the mean of its divisors is an integer number (1163616948).

Almost surely, 2^3878723155 is an apocalyptic number.

3878723155 is a deficient number, since it is larger than the sum of its proper divisors (775744637).

3878723155 is an equidigital number, since it uses as much as digits as its factorization.

3878723155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775744636.

The product of its digits is 1411200, while the sum is 49.

The square root of 3878723155 is about 62279.3959106862. The cubic root of 3878723155 is about 1571.1932123564.

The spelling of 3878723155 in words is "three billion, eight hundred seventy-eight million, seven hundred twenty-three thousand, one hundred fifty-five".